Combined mixing and grinding mill



May 6, 1941. B. H. FLYNN 2,240,841

COMBINED MIXING AND GRINDING MILL Filed Feb. 25, 1940 Q l N ir- WITNESS g Patented May 6, 1941 UNITED STATES vPATENT VOFFICE.

COMBINED MIXING AND GRINDING MILL Benjamin II. Flynn, Alexandria, La.

Application February 23, 1940, Serial No. 320,491

7 Claims.

The invention aims to provide a new and irnproved combined mixing and grinding mill which will effect a thoroughly homogeneous mixture of any materials passedftherethrough, leaving no balls, clods or the like therein, novel provision being made for crushing such balls,- clods and the like and for even crushing any stones below predetermined size which may be feciy into the mill with other materials being mixed. Not only is the improved mili well adapted for use in the manufacture of vitreous products such as brick and tile, but it finds an important field of use in mixing materials for. the construction and/or maintenance of present day roadways.

Figure 1 of the accompanying drawing is a longitudinal sectional view partly. in elevation showing a three-stage combined mixing and grinding mill constructed in accordance with the invention.

Figure 2 is a side elevation of one of the stationary cutting disks as viewedirom the discharge end of the machine.

Figure 3 is a side elevation of one of the rotary cutters as viewed f-rom the discharge end oi' the machine.

Figure 4 is anedge view of the cutter shown in said end wall being provided with an appropriate central bearing 9. 'I'he three sections may well be anged at I0 and detachably bolted together as shown at II, permitting the easy removal oi any section or sections not necessary for the particular operation to be-performed.

'I'hree stationary cutting disks I2, I2land I2 are removably secured in the three casing sections 6, IiEL and 6b, respectively, cap screws I3 being shown passed through the side walls of said sections and into said disks for so mounting them that any disk or disks not needed, may

be easily removed. All .of the disks I2, I2* and i Iib are provided with central bearings Il axially alined with Vthe bearing 9 of the end wall 2.

These bearings receive a shaft I5 which may be driven by any suitable means, a portion of a driving means being shown at I6 in the form of a sprocket. A primary assemblage of elements is provided on the shaft I5 within the primary casing section 6; a secondary assembiage is provided on said shaft within the secondary casing section 6a; and a tertiary assemblage is provided on said shaft within the tertiary casing section 6b. As all of these assemblages are substantial duplicates in the present disclosure, a description of the primary assemblage will sumce.

suitably keyed upon the shaft I5 are a num- 'ber of hubs, most of which are denoted at I1, one, however, being indicated at I1, this hub I1` being disposed at the inner side of the stationary cutting disk I2 while the hubs I1 are between said hub I1a and the casing end wall 8. Each hub I1 carries a series of pitched circumferentially spaced blades or paddles I8 to thoroughly mix the materials and at the same time, feed them toward the stationary cutting disk I2. The paddles I8 of each series areadvanced circumferentially to some extent beyond the paddles of the immediately preceding series so that no paddles will be in the way of the materials fed toward the disk I2 by the preceding paddles. If desired, any or al1 of the paddles I8 may be apertured to effect more'thorough mixing of the materials and for illustrative purposes, I have shown V-shaped notches I9 in the rear or trailing edges of a number of said paddles, and pointed teeth 20 between said notches. The hub I1B carries circumferentially spaced blades or paddles I8a which not only mix and feedl the materials, but force them through apertures in the xed cutting4 disk I2. As seen in Fig. 1, the l angle 2| between the rear or trailing edge portion oi each blade or paddle I8a and the disk. I2, is much more acute than the angle 22 between said disk I2 and the front or leading edge of said blade or paddle. Thus. the mixture is wedged between the disk I2 and the blades or paddles IiiIl as these blades rotate and consequently said materials Iare forced with great pressure through the apertures of said disk I2, and crushed against said disk. f

Another hub 23 is suitably keyed onthe shaft I5 at the outer side of the fixed cutting disk I2, said hub 23 being provided with cutting arms 24 which not only cut the materials extruded through the apertures of the disk I2 but feed it toward the delivery end of the machine, producing still further mixing and homogenlzlng of are gradually reduced to a greater state of nnesaid materials. ness. In order to accomplish this, the apertures The mixing and feeding means I1, I3, the ofthe disks such as i2* and i2. beyond the primixing, feeding and crushing means 11e, ile, mary disk I2, are ot course gradually reduced and the cutting and feeding means 23, 24, conin size. e stitute the Iassemblage of elements withlnithe pri- As previously intimated. one field of use for mary stage of the mill, and it will be seen that my improved mill ls road or highway constructhat assemblage is duplicated in the present distion. At present, roadways are frequently formed closure for the secondary and' tertiary stages. by mixing Portland cement. oil, uphalt or other Consequently, a further description 0f the ele- 10 binding materials Withthe soil 0n the site of ments rer the latter stages will not be necessary. the proposed road. While machines have been In the present disclosure, somo o1' the aperdevised for scarifying the soil and mixing the tures through the fixed.- cutting disl: i2 are in binder with the same, the eifectiveness of such the form of e1ongete'd slots :s and other; m machines varies considerably owing to the nature mere perferations 26. Each slot 2l is provided 15 0i' the e011 beine treated. In some cases. they with e, wide outer end 21 and with o, nan-ow will not produce entirely satisfactory results, esinner end 2a, the latter being close to the we pecially with respect to obtaining a thorough mixof the disk i2 and the former remote from said iure 0f the meierieis- With the Present invenaxis. "The inner end 2s of the slot 2l is adtion. S0115 0f eil kinds Whether herd eier. eravvanced V(in the direction-in which 'the cutting 20 elly clay, Send Clay. Sticky wet gumbO. shale arms 24 rotate) beyond the wide outerr end 31 bearing soilfetcz, may be treated with the binder and it will be seen that the longiudmal edges to` obtain the uniform mixture necessary to pro- 29 and 3o of the slot converge from om wide duce the best results. The cement, and water end to said narrow end. Ihe inner edge 2l is ol ille oil asphalt' etc iS fed in propel' Proporlohgitudiueuy convex and the outer ed 3| i, 425 tions into the hopper 1 together with soil. the longitudinally concave' und it is preferable to latter in some cases being screened to prevent provide both er these edges with transverse ribs the enligne 0f mi end lumps i0 iere i0 be si which eid in crushing nerd pieces er materiel handled by the mi11- such as clods or balls of clay, or stones, as here- Excellent results may be obtained from the iuufter explained, The nh, 3| are prefmly 3o general construction shown and described and so pitched as to am in fee-ding the materials it is, therefore, preferably followed. However, through the slots 25. e e l within the sc ope of the invention as claimed.

The arms 24 of the rotary cutter have their Vollc'iliono maybemcdeocabove tailed- `front or leading edges 32 concavely curved, and Iclil'lml' the outer'end 33 of each of these edges is ad- 35 lf A mlll 'compllslllg o horizontal oylindi'ioli vanced in the direction of cutter r'ctetien. becasing heviii e materiel inlet in its iop at one yond the inner end 3l. 'I'hese'edges 32 thus cool 'lts ends' sold casing llavlllg an @lid Willi It operate with the siete zt in such manner that .Seid One 0f iis'endii end e150 hevin e stationary any herd pieces of themateriels projecting part; i. apertured cutting disk parallel with said end wall 1y through the Wide outer ends 21 of the slots `40 and spaced therefrom beyond said inlet, said end 25 wm be engaged by the cutter edges n andV wall and said cutting disk being provided with moved vtoward andlnto the narrow ends 28 of "central illllloii bearings a driven Slift mounted the slots. As the hard pieces are thuslmoved,l -lll said bearings o' plurality of Series 0f Circumthere is a tendency to crush them as'theyare 'fcl'clltlolly spaced Plicl'led mixing and feediiil wedged into the narrow slot ends, and 'the vribs 45- Poodles 'on said Shaft fOr mixing the materials 3i assist in this operation. Also by movingthe f and leem lllcm low-ald said cillilll'i disk' il hard pieces into the inner' ends of the slots. if 1 series of pitched circumferentially spaced mixing. they have not been previously cut by the cutting lilccllii @iid crushing Paddle! 0n Bild Shaft beedges 32, thesel edges will-'sever them at points lwccn sold mlxlns and fccdln Paddles and scid close to the axis of the shaft i5.' permitting the 50 clltllllg illsk and disposed in close felation With severing and crushing to be'done with less power ille inner Side 0f Said cutting disk. said mixing, than if et peints more remote from the' shaft feeding and crushing Paddles beine pitched t0 exis, crush the materials against said disk and force 1n chelation,` the materials te be mixed are iiiemihi'iiiiii the apertures' 0i Seid disk. and a fed inte the in1et 1` with the shaft is. and parts 55 mim cutter ii Seid Siiii et the Outer eide 0i thereon rotating. The various paddles i8 and solo disk and having cutting edges faoin iii the iaiL mix the materiau and feed them toward difeciidn 0f cutter rotation for Giittiiis the mathe nxed eumugoisk n, through the apertures terials extruded through said apertures.

of which they are forced by the paddles or blades 2 -A llllll compri-img a llollzonilal cyiindfici m. Net on1y de these peddies er biases ne tov Casing havin@ e materiel inlet in its te at one perform this function, but they will crush stones, 'of' lts clldsi said cilsllig -llilvlllg .all end Woll al bells er ciods against the 'disk i2 and force the Said me 0f its ends and e150 having e Stationmaterials on through thedisk apertures. j'Ihe'v al'y opcltul'cd cutting disk Parallel with Said end mixed materials extruded through these aperturesl TW-.all anllspcccd therefrom beyond sold inleiare thcreughiy breken up and thus further mixedrs #eid 9nd Wall and Said milling disk beine Proby means of the cutting 'e1-meu, und due-5to; vided with central alined bearings. a driven shaft the cooperation' of these arms with the slots 2 5 f mounted lil said bearings a' Pliimiiiy 0f Series 0f as above described, any hardpieces of the me: u .eircuniferentially -spaced pitched mixing and terial, such as bells or clods, 'steh-ee' or-,grev'eh Afeeding paddles on said shaft for mixing the mawill be effectively crushed with the expenditure.. terials and feeding them tOWiii'd Said dumm! of little power. When the mill embodies sec disk, a series of pitched circumferentially spaced ondary and tertiary units as herein disclosed `ymixing, feeding and crushing paddles on said or any other desired number of units,the actions aft between said mixing and. feeding paddles occurring within them are duplicates of that. oc-i said cutting disk and disposed in close reeurring within the first stage andthe materials'75 latlonwith the inner side of said cutting disk,

said mixing, feeding and crushing paddles being pitched to crush the materials against said disk and force them through the apertures of said disk, each paddle of said additional series being at a much more acute angle to said disk at its trailing edge than at its leading edge to forcibly crush the materials against said disk and force them through thedisk apertures, and a rotary cutter on said shaft at the outer side of said disk and having cutting edges facing in the direction of cutter rotation for cutting the materials extruded through said apertures.

3. A mill comprising a horizontal cylindrical casing having a material inlet in its top at one of its ends, said casing having an end wall at said one of its ends and also having a stationary apertured cutting disk parallel with said end wall and spaced therefrom beyond said inlet, said end wall and said cutting disk being provided with central alined bearings, a driven shaft mounted in said bearings, a plurality of series of circumferentially spaced pitched paddles on said shaft for mixing the materials and feeding them toward said cutting diskua series of pitched cirv cumferentially spaced mixing, feeding and crush' ing paddles on said shaft in close relation with the inner side of said cutting disk and effective to .crush the materials against said disk and force them through the apertures of said disk, and a rotary cutter on said shaft at the outer side of said disk andhaving cutting' edges facing .in the direction of cutter rotation for cutting the materials extruded through said apertures; a-t

vleast some of said disk apertures being in the form of slots, said slots each having a wide outer end remote from the cutter axis and a narrow inner end close to the cutter axis, said narrow inner end being advanced beyond said wide outer -end in the direction of cutter rotation, the outer longitudinal edge of each slot being concavely curved and the inner longitudinal edge convexly curved, said outer and inner curved edges converging from the wide slot end to the narrow end; each of said cutting edges being concavely curved and having its outer end advanced beyond its inner end in the direction of cutter rotation; whereby the outer ends of said cutting edges will reach said wide outer ends of said slots before the inner ends of said cutting edges reach said narrow inner ends of said slots, causing the curved edges of the slots and cutting edges to cooperate in forcing hard pieces of material from said wide outer ends of the slots into said narrow inner ends thereof, tending to -crush the pieces as they are wedged between said converging slot edges and positioning the pieces close to the cutter axis for easier cutting. y

4. A structure as specified in claim 1; at least some of the rst mentioned series of paddles being provided with alternate notches and teeth disk secured in said casing beyond and parallel with the first named cutting disk and having a central bearing through which said shaft is extended, secondary series of mixing and feeding paddles on said shaft between said cutter and said secondary disk for further mixing the materials and feeding them toward said secondary disk, a secondary series of pitched mixing, feeding and crushing paddles on said shaft associated with said secondary mixing and feeding paddles and said secondary disk in substantially the same manner as the first mentioned mixing, feeding and crushing paddles are associated with said first named disk, and a secondary rotary cutter on said shaft cooperating with said secondary disk in substantially the same manner as the first named rotary cutter coacts with said first named disk.

6. In a combined mixing and grinding mill, a fixed cutter disk provided with apertures through which a mixture of materials is extruded, at least some of said apertures being in the form of elongated slots; and a rotary cutter at the outer side of said disk and having cutting edges facing in the direction of cutter rotation; said outer ends of said cutting edges will reach said wide outer ends of said slots before the inner ends of said cutting edges reach said narrow inner ends of said slots, causing the curved edges of the slots and cutting edges to cooperate in forcing hard pieces of material from said wide outer ends of the slots into said narrow inner ends thereof, tending to crush the pieces as they are wedged between said converging slot edges and positioning the pieces close to the cutter axis for easier cutting.

7. A structure as specified in claim 6; said edges of said slots being provided with transverse pitched ribs which aid in crushing the hard pieces of material and in feeding the material through said slots.

BENJAMIN H. FLYNN. 

